garst



No. 62I,649. Patented Mar. 2l, |899.

S. H. GARST.

CULTIVATUB.

(Application Bled June 8,- 1898.)

(No Model.)

UNITED STATES PATENT OEE-TCE.

STEPHEN II. G ARST, OF DETROIT, MICHIGAN, ASSIGNOR TO THE AMERICAN i HARROW COMPANY, OF SAME PLACE.

cuLTlvAToR.

SPECIFICATION forming part of Letters Patent No. 621,649, dated March 21, 1899. 'Application led June 8, 1898. Serial No. 682,917. (No model.)

T0 all whom, t may concern:

Be it known that I, STEPHEN H. GARsT, a citizen of the United States, residing at Detroit, in the county of W'ayneand State of Michigan, have invented certain new and useful Improvements in Cultivators, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates more specifically to the spring-trip for cultivator-teeth; and the invention consists in the peculiar construction, arrangement, and combination of part-s, as more fully hereinafter described and claimed.

In the drawings, Figure l is a side elevaltion of a cultivator-bearn provided with myl improved'spring-trip. Fig. 2 is a central longitudinal section with the parts in their tripped position. Fig. 3 is a perspective view of the adjustable stop.

A is a cultivator-beam comprising the horizontal portion a and the downwardly-extending substantially vertical portion l), preferably curved, as shown in the drawings. To the lower end of the vertical portionis hinged v the tooth-section B, which preferably comprises the bifurcated shank c, embracing the beam and pivoted upon the pin d, the upper ends of the bifurcated portion having the'rearwardly-openin g slots e, which engage with a stop-pin f.

C is an arm extending rearwardly from the section B, being preferably pivoted upon the pin d and having the lug g bearing against the rear face of the section B, below the pivotal point.

D and E are toggle-levers pivoted to each other and respectively to the arm C and pin' f, the upper lever E being bifurcated t-o embrace the shank c and having thelugs h bearing upon the beam A.

The construction so far described has been used heretofore, a spring being provided to hold the toggles normally in a position in which they are almost locked, which spring will be overpowered when any obstacle is encountered by the harrow-tooth which might endanger the breaking of the same and will permit the tooth to trip; but in such previous construction it has been generally customary tolocate the spring low down upon the beam in proximity to the toggle-levers and withits coils surrounding the pin f. At Athis point the -spring will be brought into contact with the mud or moist earth, which will cover it and soon rust it out. Moreover, as but afew coils can'be conveniently placed in the spring it is liable to breakage.

justable stop at a point where it will limit the movement of the levers sufficiently to prevent them from absolutely locking, and this also will be covered with mud and so corroded as to often render adjustment impossible.

It is my object to overcome those objections, which I accomplish in the following manner:

Again, it is necessary to place a set-screw or some other ad- F is an arm or extension of the lever D,

formed of the clamping-plates j, secured together by the bolts or screws la.

The parts being thus constructed, the trip may be set to brake back at any desired pressure by adjusting the stop I up or down on the arm F, which on account of the curved form of the beam against which said stop strikes will vary the distance at which the toggles D and E stand from the dead-center line.

It will be observed that both the s top I and spring .G are high enough above the tooth to be out of the dirt, while the spring arranged in that position may be of sufficient length to avoid all danger of overstraining it. Furthermore, the arm F being directly in rear of the beam is protected thereby and forms no obstruction.

What I claim as my invention is- 1. The combination with the beam and a tooth-section hinged thereto, of an arm extending rearwardly from said tooth-section, a toggle-lever connection between said arm and IOO a point thereabove onpthe beam, an offset upward arm or extension of the lower member of said toggle-levers, and a horizontally and forwardly extending spring connected at one end, to the upper end of said arm and at its opposite end to the beam.

2. The combination with the beam and a toothsection hinged thereto, of an arm extending rearwardly from said tooth-section, a toggle-lever connection between said arm and a point thereabove on the beam, an oset npward arm or extension of the lower member of said toggle-levers, a spring connecting the upper end of said arm with the beam, and a stop vertically adjustably secured to said arm and adapted to bear against said beam.

3. The combination with the cultivatorbeam, having the curved downwardly-extending end portion, the tooth-section pivoted to the lower end thereof,a spring-actuated toggle for holding the tooth-section into the work, an extension therefrom beside the curved end of the beam, and an adjustable bearing for the extension against the curved beam, for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

STEPHEN 1-1. eARsT.

Witnesses:

R. H. LOGAN, L. M. VAN RIPER. 

